The atom Flashcards
Explain the dalton model
Solid sphere
No protons, neutrons, electrons
Explain the plum pudding model
Cloud of positive charge
Negatives electrons embedded
Explain what happened in the alpha scattering experiment
Positively charge alpha particles fired at gold foil
Particles bounced backed and were deflected
What did scientists expect to happen for the alpha scattering experiment
Expected the alpha particles to travel through the gold
What did the alpha scatter experiment tell scientists about the structure of the atom
There is a positive charge and a mass that must be concentrated in a small space in the middle of the atom
Nucleus
Explain the nuclear model
Electrons orbit the nucleus
Not at set distances
Explain the electron shell (Bohr) model
Electrons orbit at set distances in shells
What did James Chadwick discover and how
Neutrons
Did experiments that gave evidence of particles with no charge
Give relative charges of neutrons, protons, electrons
Protons: +1
Electrons: -1
Neutrons: 0
Relative mass sub atomic structures
Proton + neutron: 1
Electrons: 0
What does the number of protons tell you
It’s atomic number
How to calculate neutron number
Mass number - atomic number
How to work out electron number
Atomic number
Same as protons
What is an element
Substances made of one type of atom
What is compound
Different types of atoms chemically bonded together
